HTMLParser.lastPhase and beforeRCDataPhase are unused fields

[natebosch]

html5lib-python/html5lib/html5parser.py

Lines 166 to 168 in b2b08cc

	self.lastPhase = None
	self.beforeRCDataPhase = None

lastPhase used to be a useful field, it appears it was renamed to originalPhase in 43a2727

From what I can tell beforeRCDataPhase was something was either introduced unnecessarily or was partially removed during code review. The commit which introduces it does not assign an interesting value, and there are no reads. 566ca68